"Todd has a very original concept for it," Vaughn said between takes. "Nothing like what you would expect. It's pretty funny. I'm excited to see what he draws up."

"Old School," a comedy about three friends who crack under the pressures of adulthood and form a fraternity, was packed with the same over-the-top wit Phillips displayed in 2000's "Road Trip" but was peppered with insight into the plight of the newly grown-up. The flick's themes resonated with people in their late 20s and early 30s in particular, eventually making more than $75 million at the domestic box office.

"People our age definitely got a kick out of it," the 31-year-old Wilson said recently. "I had a great time on that movie, and that's such a good feeling. I had so much fun with Will and Vince Vaughn, and [we] just hoped people liked it when they went to see it, because we did have a good time making it."

Wilson said the trio had joked about making sequels while on the set but that he never took his co-workers seriously. "I just figured those guys wouldn't be up for it because it was something we just kidded around [about], like, 'Yeah, when we make 'Old School 2' and then when we make 'Old School 3' when we're like 55 ...' But I heard those guys were up for it and I was like, 'Heck yeah, I'd love to do it.' "

Though Phillips would say only that "the plot of 'Project X' is as guarded as the plot of the next 'Matrix,' " Wilson was slightly more forthcoming.

"They're trying to make it seem like a secret government thing [with the working title 'Project X'], but what I heard was they go to Daytona Beach [during spring break] or something. I don't know anything about it besides that, but hopefully it will all come together."

Still in the early stages of development, "Old School 2" — or "Project X," or whatever — will probably begin shooting sometime next year, Phillips said, presumably without the use of government lab monkeys.